Switch



Jan.- 6, 1931. L. P. BOLL :TAL

l swI'rcH u)"led Aug'. 16, 1928.

2 Sheets-Sheet 1 Jan. 6, 1931. L. P. BOLL ETAL 1,787,772. L

SWITCH Filed Aug. 1e, 192e 2 Sheets-sheet 2 i Patented Jan. 6,1931

'umani-.STATES lmiuls'r voFI-lclaz f Lm'rnn PIERCE A1301.1.,"01' mArLEwoon, AND 'rHEoDoRE BmxENnt'ArnayoF sr. Louis,

mssoum, AssIeNoas To w. N. MATTHEWS oomonA'rIoN,l or sr. Lours,mssoun1,

AconronA'rIoN or'mvxssounr swn'crr Application :umy August 16,1928. serial No. aoopmi.`

n This invention relates: topswitches and-with regard to certain` more specific features, vto fuseswitches and the like, of the `box or `case type for expulsion fuses Among the several objects of the invention maybe noted the provision of a. simplified box `type of fuse swi-tchincorporating a compact Wcombined double tube and movable bottom construction land-,having readilyi removable contacts inthe mounting of which molded supporting means are entirely eliminated, whereby means is afforded for producing a switchassembly of minimum dimensions and manufacturing cost` with maximum usefulness. Otherobject-s will be in part. obviou and in part pointed outhereinafter. wv- The invention accordingly comprises the Ielements and` combinations of elements, fea.- tures of construction, and arrangements of zoparts which'will be'exemplifed in the structure hereinafter described, and thescope of the application of which will be indicated in,A

rthefollowing claims.` 'u i n Inthe accompanying drawings, in which is illustrated oneof various possible embodiments ofthe invention,k y

Fig. 1 is a side elevationof the switch shownapplied to a cross arm; s a

Fig. 2 is a vertical section taken through the switch,certain parts being shown in alternatedotted-line positions;

` Fig'.3 is a front elevation of theswitch, certain portions being brokenaway,L f 'l p Fig; 4 .'s a bottomplan view of the switch; and, Y

Fig. 5 is a fragmentary front elevation-of the lower portion of the switch.

Similar reference characters indicate cor-` responding parts `throughout the several views of the drawings. i i i Referring now more particularly to Fig. 1, vthere is illustrated at numeral l` a casev or housing composed preferably of porcelain, bakelite or other insulating material.` This case or housing 1 is supported from an ad- .:justable mast arm 3 adaptedto be fastened to .a crossarm 5V (see Fig. 1). The support betweenithelmast arm3and thecase or box 1 is effected by means ofa bolt7 held to'the box by means of alloy, cement or other simiportion, of doorll and the side walls 21-are .two spring Washers 23 on the pin 13. SaidV .spring washers 23 are adapted l.to hold the lar material. The fzaistening` is at the of Vthe box i only, thereby permittingfree expansionand putting the box material in compression `when a fuse blows, as will appear hereinafter.,` In effect the mounting is a susp'ension.r y s i A door 11 made of insulating'material is hinged tosaid box 1 on a tube 13, thereby forming an upwardly opening closure for the front of the box (see Fig. 2). A finger pieceV 15 is provided at the bottom of said door or closure 11. The door, when shut, rests in parallel recesses 17 formed in the side walls21 of the case 1. Interposed between the upper door l1 in open position, whenopened past its dotted-line position indicated in Fig. 2.

In itsclosed position, door 11 is so held by a strap 24 of spring material, the end portions.26,.thereof being bent at slightly less than right angles, for gripping the sides 21 of the case 1. (See Figs. 1 and 4.) The strap 24 isheld to the door by means of twoscrews 28, which are screwed into a pair of plugs 30 of alloyor the like.

A novel feature of the invention isin the mounting of `a pair of spring terminal'engaging elements or clips 25. These clips each comprise'a pair of U-shaped springmembers 27 riveted toterminal members 29, the latter being composed of metal and bored at4 31 to rotatably receive metallic.` tubular. pins 32, the latter being provided at both ends with g5 `eccentric sleeves 33, :lightly fittedthereon. a The sleeves 33 are positioned in sideward openings 34, Vformed in the walls'21 of the case 1. This arrangement permits adjusting thek alignment .of the' cartridge tube 53 and the clips 25 during assembly. It is tobe understood that the openings 34 are preferably formed during the moldingprocess used in making the box; f f

It will be seen from Fig. `2 that each terminal member 29 comprises arocker having an upper arm 35 and a lower arm 37, the-latter being provided with a set screw'39A passing therethrough and engaging theback of the box 1. By backing off the set screws 39, spaces are provided whereby the hollow terminal hinge pins 32 (including their' eccentrics) may be passed loosely through the openings 34 and also through said rocker members 29. In order to tighten the members 29 in place it is only necessary to screw downl the set screws 39, whereupon they engage the back ofthe box and fulcrum the members 29 on their lupper arms 35, thereby swinging the lower portions of the members 29 in such fashion as to force the eccentrics of the hollow pins 32 against the sides of their openings 34. Hence, without any molding requirements, there is provided a set of supports for the terminal clips 25 and at the same time a support for certain hinging means to be described and a set of line terminal sockets. It is to be understood that the broad features of this construction, as claimed, are independent of the eccentrics as they may be dispensed with where it is ossible to form accurate openings 34 in the ox. In effect the eccentrics are portions of the tubes 32.

The line terminal sockets comprise the tubular members 32 which are adapted to receive the line wires. In order to hold the line wires in said sockets, Vthe screws 41 are threaded through bosses formed with the terminal members 29. Openings in the tubular members 32, aligned with the threaded openings for the screws 41, permit entry of said screws to hold the line wires.

As shown more particularly in Fig. 2, the lower terminal member 29 is rovided with a downward extension 43, t e purpose of which is to support a hinge pin 45 on which hinges a clamp member 47, said member 47 passing around and lclamping a tubular portion 49, the latter carryin integrally therewith a bottom 51. It is to e understood that other fastening means than said clamp 47 may be used. The tube 49 and bottom 51 form a cartridge support. The portions 49 and 51 are composed of insulating material. They comprise a tubular cartridge support and a bottom.

Located within, and annularly spaced from the tube 49 is a cartridge tube 53 comosed of insulating material, to which is held Ey means of a set screw 55, a terminal engaging element 57 for electrically engaging the lower spring clips 25. A slot 59 is machined in the side of the terminal engaging element 57 for receiving one end of a fuse link `61, the other end of which link 61 is located at the upper end of the tube 53, the link having a hairpin turn 63 between its ends.

The set screw 55 also holds to the terminal engaging element 57 an outer guide lring 65 carrying a set screw 67 for holding in place the end ofthe short leg of the fuse link 61.

A notch 66, cut in the upper periphery of tube 49, is adapted to receive a corresponding leg or extension 68, formed on the lower end of the guide ring 65, thereby determinin the proper position of the guide ring, an

consequently of the cartridge, on the tube 49, so that pro er engagement may be effected between t e terminal and the terminal engaging elements. From the above it will be seen that the tube 53, terminal engaging element 57, guide ring 65 and the fuse lin 61 comprise a single unit. Added to this unit at the upper end is a cap or upper terminal engaging element 69 screwed to the tube 53 and provided with an anvil 71 against which anvil the upper end of the fuse link 61 lies so as to' be engaged by a set screw 73 screwed oppositely through the ca 69 and tube 53. The cap 69 has fastened t ereto an engaging loop 75 for purposes of applying a tool for opening the switch.

In operation, when the switch is to be opened the door 11 is first raised, the tool or hook applied to the ring 75 and the tool drawn downwardly, whereupon the tubular fuse unit is pulled through the dotted line position shown in Fig. 2. It will be noted that tube 53 is drawn'down as well as the outer annularly spaced tube 49 and the bottom 51. After the cartridge has been pulled down enough to clear the open door l1, the tube 53 is grasped and pulled outwardly, thereby withdrawing the terminal engaging element 57 and the guide ring 65 from the tube 49. A new cartridge may then be applied to the box or the old cartridge returned with a new fuse.

In Fig. 4 is shown how the bottom of the annularly arranged tube 49 is provided with a series of lugs 77 for the purpose of spacing the tube 53 from the tube 49 even though it should have a tendency to misalign, due to loose co-operation between the guide rin 65 and the tube 49. It will be noted from Fig. 2 that the relative elevation of the cartrid e with respect to the tube 49 is controlled by t e engagement indicated at numeral 79. It will also be noted from Fig. 2 that the long and the short legs of the fuse link 61 are enclosed by tubular portions, the long leg by the tube 53 and the short leg by the tube 49, so that when the fuse blows, all the gases will be ejected from the box instead of being trapped therein so as to tend to explode the switch.

When a fuse blows the reaction is upward,v so that the porcelain or the like of the box is placed in compression only, due to the single upper suspension. The ring 65 closes the upper end of the outer annular tube 49 and the terminal engaging element 69 closes in thecartridge tube 53.

By means of the above construction it will be seen that extraneous and complicated littings are eliminated and that a fewer number of parts have been caused to e'ect better results.

In view .of the above, it will be seen that the several ob'ects of thel invention are achieved and ot er advantageous results attained; 4 g

As many changes could be made in carrying out the above constructions without de'- parting from the scope of the invention, it is intended that all matter' contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

IVe claimz' ff I 1. In a switch housing, a terminal support comprising a pin passing through openings in the -sides of the housing. a fulcrum member within the housing rotatably mounted on the pin, said member supporting a terminal and extensions on said member on opposite sides of the pin, means in one of the extensions adapted to be forced into engagement with the housing, whereby the fulcrum memberfis fulcrumed on the opposite extension to force the pin against the sides vof said openings to hold the pin in place.

2. In a switch housing, a terminal member comprising a tube passing through openings in thev sides of the housing, a fulcrum member within the housing rotatably mounted on the tube, said member supporting a terminal, and extensions on said member on opposite sides of the tube,.means in one of the extensions adapted to be forced into engagement with the housing, whereby the fulcrum member is fulcrumedjon the opposite extension to force the tube against the sides of said openings to hold said tube in place and means for fastening line wires within the tube.

3. In a switch housing, a terminal member comprising a tube passing through openings in the sides of the housing, a fulcrum member within the housing movably mounted on the tube, said member supporting a terminal, at least one extension on the member and means thereon adapted to be forced against the housing to fulcrum the member on said extension, whereby the tube i-s moved to-tightly engage the sides `of said openings.

4. In a switch housing, a terminal support comprising a pin passing through openings in the sides of the housing, a fulcrum member within the housing and movably mounted on the pin, said member supporting a terminal, at least one extension on saidvmemberk and means thereon adapted to be forced against the housing to fulcrum the member on said extension, whereby the pin is moved toengage the sides of the openings.

5. In a switch housing, a support comprising a pin passing through at least one opening in the housing, a fulcrum member movably mounted onthe pin and at least one extension on the member with means on the ful-l crum member' adapted to be forced against the housing to fulcrum said member on the extension, whereby the pin is moved to tightly engage said opening.

6. In a switch device, a support comprising a pin passing through at least one opening in the device, a fulcrum member movably mounted on the pin and at least one extension on the member with means on the ulcrum, member adapted to be forced against the device to fulcrum said member on the extension, whereby the pin is moved to ti htly engage said opening, said fulcrum mem er supporting a terminal clip and hinging means for a cartridge support. y

7. In a switch housing, a terminal support complrising a pin passing through openings in t e sides of t e housing, an eccentric mounted at each end of said pin withinfeach opening, a fulcrum member within thehousing and vrotatably mounted on the pin, said member supporting a terminal and extensions on said member on opposite sides of the pin, means in onefof` the extensions adapted tobe forced into engagement with the housing,

whereby the fulcrum member is fulcrumed on the o posite extension to force the eccentrics against the sides of said openings, whereby the pin is held in place.

In testimony whereof, we have signed our ynames to this specification this `14th day of August, v1928. l A

LESTER PIERCE BOLL. THEODORE BIRKENMAIER.

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